Update README.md

README.md

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 # Android-flash-memory-backup
 备份安卓手机字库(flash_memory_backup)
+
+下载文件到手机或者电脑
+```
+wget https://raw.githubusercontent.com/xxx252525/Android-flash-memory-backup/main/flash_memory_backup.sh
+或者
+curl -O https://raw.githubusercontent.com/xxx252525/Android-flash-memory-backup/main/flash_memory_backup.sh
+```
+
+git下载
+```
+git clone https://github.com/xxx252525/Android-flash-memory-backup.git
+```
+
+如果是下载到电脑上的，请传输文件到手机中
+```
+adb push PC路径 /sdcard
+```
+
+然后在手机上赋予执行权限后执行文件
+```
+./flash_memory_backup。sh
+```